edx/edx-platform — pull request #2124 by jorr-at-google (2014-01-09 22:42:18+00:00)
Title: Factor the core Capa problem logic into a mixin.

This mixin can be used by either the current XModule, or by an XBlock. Leave the XModule-specific code in capa_module and move the shared code to capa_base. Plan to move caba_base into the capa package in the future.